Sequential extraction of 226Ra in sediments from an estuary affected historically by anthropogenic inputs of natural radionuclides
| Autor: | J. L. Aguado, Rafael García-Tenorio, Juan Pedro Bolívar |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Geologic Sediments
Water Pollutants Radioactive Health Toxicology and Mutagenesis media_common.quotation_subject Natural (archaeology) Environmental Chemistry Fertilizers Water pollution Waste Management and Disposal media_common Hydrology Radionuclide geography geography.geographical_feature_category Radioactive waste Sediment Estuary General Medicine Contamination Pollution Speciation Radon Chemical Industry Environmental chemistry Environmental science Environmental Monitoring |
| Zdroj: | Journal of Environmental Radioactivity. 74:117-126 |
| ISSN: | 0265-931X |
| DOI: | 10.1016/j.jenvrad.2004.01.016 |
| Popis: | Riverbed sediments from an estuary historically affected by wastes discharged by several phosphate fertiliser plants and enriched in uranium-series radionuclides were operationally speciated using a Tessier-based method. In each selective fraction the (226)Ra content was determined by alpha-particle spectrometry after radiochemical isolation and electrodeposition onto stainless steel planchets. These studies were performed in (226)Ra-polluted estuarine sediments collected one year after anthropogenic discharges had ceased in order to obtain useful information about the operational forms in which this radionuclide remains associated with the sediments at this time. The results obtained revealed that one year after (226)Ra inputs had stopped, the radionuclide was associated mostly with the more refractory forms. Consequently, it is possible to foresee little potential remobilisation of (226)Ra contamination from sediments to the aqueous phase in the future under normal environmental conditions. |
| Databáze: | OpenAIRE |
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